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I read in the Toronto Star some time around Sept 12 or 13 of that year, that the towers collapsed because the momentum of the airplanes impacted and severed/severely damaged the internal core structure of the two towers. That is, the structural support from which the rest of the build was hung.
Also, that the planes exploded, and burned inside the building, not outside, which would explain why the internal support structures further degraded, and why the aluminium on the outside does not look warped or hot, and why somebody could/would stand at the opening. it was probably the coolest area with the freshest air.
Once the impact and fire damage had taken it's toll, the support of the building above the impact zone gave way, and then what you would have is what is in effect the equivalent of any normal sized office building (from the point of impact to the roof) being dropped ontop of the building below. To my eye, that's exactly what it looked like, a heaveyload falling and causing increasing damage as it gathered spead and mass downwards.
But to get back on topic, I would love to see pictures of WTC7 from the side facing the two towers, to see how much damage it sustained when the big ones collapsed. (as first pointed out by balderdash). Then we can really talk about WTC7.
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